Checking The Ignition Coil - Yamaha XT250X Service Manual

EAS28090

CHECKING THE IGNITION COIL

1. Check:
Primary coil resistance
G
Out of specification → Replace.
Primary coil resistance
0.18–0.27 Ω
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
a. Disconnect the ignition coil connectors from
the wire harness.
b. Connect the pocket tester (Ω × 1) to the igni-
tion coil as shown.
Pocket tester
90890-03132
Positive tester probe
Orange "1"
Negative tester probe
Ignition coil base "2"
c. Measure the primary coil resistance.
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2. Check:
Secondary coil resistance
G
Out of specification → Replace.
Secondary coil resistance
6.32–9.48 kΩ
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
a. Disconnect the spark plug cap from the igni-
tion coil.
b. Connect the pocket tester (Ω × 1k) to the ig-
nition coil as shown.
Pocket tester
90890-03132
ELECTRICAL COMPONENTS
Positive tester probe
High tension code "1"
Negative tester probe
Orange "2"
c. Measure the secondary coil resistance.
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3. Check:
Ignition spark gap
G
Out of specification → Follow Step 5 and later
of the ignition system troubleshooting proce-
dure.
Refer to "TROUBLESHOOTING" on page
7-3.
Minimum ignition spark gap
6.0 mm
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a. Disconnect the spark plug cap from the spark
plug.
b. Connect ignition check "1" to the spark plug
as shown.
Ignition checker
90890-06754
Opama pet-4000 spark checker
YM-34487
7-43